Carburetor



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CARBURETUE.

application filed. august 7, 19%. lterlal l lo. 127,744).

buretor and the mixture is thinned by further addition of air beforepassing into the engine.

Une ofwthe principal objects of the invention is to provide a means foradding addim tional air to the charge in a manner to greatly increasethe turbulence and to produce a finely atomized charge which will notreadily condense. This is accomplished by providing a flow of airopposed to the flow of the charge through the venturi from which thecharge leaves the carburetor.

Another object of the invention is to provide a double venturi at theliquid fuel inlet of the carburetor by which air is added to theover-rich mixture before passing through the final venturi whichproduces the turbulence.

These object-s and the several novel features of the invention arehereinafter more fully described and claimed and the preferred form ofconstruction by which these objects are attained is shown in theaccompanying drawings in. which- Fig. 1 is a longitudinal sectionthrough a carburetor embodying my invention.

Fig. 2 is a section taken on line 2-2 of Fig. 1.

Fig. 3 is an end view of the venturi con taining the liquid fuel nozzle.

The carburetor comprises a float chamber 1 containing the usual floatfor controlling the liquid fuel supplyand having. a liquid fuel inlet 2.The outlet 3 for the liquid fuel opens beneath the venturi l as shown inFigs. 1 and 2. This venturi 4: is provided with a nozzle 5 which iscontrolled by the needle valve 6. The venturi 4; is a double venturihaving an enlarged chamber 7 in the center and is provided with a seriesof longitudinal air passages 8 thereabout. The discharge end of theventuri 4 is in the shape of a truncated cone and a member 9 ispositioned in the conduit 10 in spaced relation with the venturi 4t.This arrangement provides a space 11 into which the apertures 8discharge. The carburetor is provided with an air inlet 12 controlled bythe choke valve13 and this air inlet opens into the conduit 14: which ispro.-

. vided with two venturis 15 'in the opposite ends which divide the airflow in two difventuris be the same size for this purpose. A valve stem16 is provided in the carburetor carrying two butterfly valves 17 and 18for controlling the conduits lt and 10. The conduit 14 opens into achamber 19 which extends completely about the venturi 20 formedintegrally with the carburetor. A series of openings 21 are providedwhich lead from the chamber 19 into the interior of the venturi 20against the flow through the venturi as shown in Fig. 1. A bypass 22 isalso provided leading from the chamber 7 in the venturi a into the pointof greatest restriction of the venturi 20. This provides a bypass aboutthe butterfly valve 18 for idling speeds of the engine. When thethrottle valves 17 and 18 are closed as shown in Fig. 1 a liquid fueland air mixture is drawn into the chamber 7 from the opposite end of theventuri from the several apertures 8. In this manner a rich mixture isdrawn into the bypass 22 and passes therethrough and is discharged intothe venturi 20providing a supply of liquid fuel for idling speeds of theengine, when the throttle valves are closed.

Tn operation the air flowing into-the intake 12 is divided into twostreams,.one of which passes through the venturi l5 and conduit 9.3 andthrough the double venturi 4. The flow of air picks up liquid fuel fromthe nozzle 5 and in passing through the chamber 7 the charge 18.agitated before being discharged from the venturi. Part of the air flowpasses through the apertures 8 in the venturi 4 and is discharged intothe space 11 between the venturi and the member 9. 0 11 account of theangle of this space this air is thrown forcibly inwardly and furthermixes the charge as it passes into the conduit 10. its the charge passesthe greatest restriction of the venturi 20 air is drawn inwardly throughthe apertures 21 against the flow througlithe venturi 20' and thusproducing a turbulence which very thoroughly mixes the gas and airbefore being discharged from the carburetor through the opening 24:. ftis to be noted that the action in this carburetor is the same whetherthe flow through the carburetor is produced by a vacuum or by pressurethrough means of a supercharger. in either case the final addition ofair is against the flow through the venturi 20 which produces a mixingaction ordinarily impossible to attain. In order to produce the desiredaction in the carburetor it is necessary that the two venferentdirections it being important that the turis 15 have the same sizedopening theretill ldl)

through and that the combined area of the openings through the venturi 4be equal to the area of the opening through the venturi 15 at the leftof Fig. 1. It is also necessary that the area of the opening throughthe.

point of greatest restriction of the venturi 20 be equalto the areas ofthe combined openings through the venturi 4 and that the area of theopenings 21 in the venturi 20 be equal to the area of the openingthrough the venturi 15 at the right of Fig. 1. With the several openingsarranged in this manner fresh air will flow inwardly through the severalopenings 21 against the directionof flow of the charge through theventuri 20 and these several streams flowing in this manner produce aturbulence and mixing action which thoroughly vaporizes the liquid fuel.The speed of the engine is controlled by turning the double valve 17 and18 by means of a stem 16 while the choke valve 13 may be utilized forstarting.

From the foregoing description it becomes evident that the device isvery simple and etficient in operation, produces a very complete mixingaction between the air and liquid fuel and provides a device whichaccomplishes the objects described.

Having thus fully described my invention, its utility and mode ofoperation, what I claim and desire to secure by Letters Patent of theUnited States is 1. In a carburetor, a U shaped main conduit, an airinlet openlng into the U shaped main conduit, a chamber into which oneend of the main conduit discharges, a venturi through which the oppositeend of the main conduit discharges, the chamber surrounding the venturiand the ventrui being provided with a series of angular aperturesadapted to direct air inwardly from the chamber against the flow throughthe venturi, a venturi in the main conduit intermediate its ends havingtwo points of restriction forming a chamber therebetween, a valvecontrolled liquid fuel nozzle opening into the said venturi having tworestrictions at the first point of restriction, the said venturi havingtwo restrictions being provided with a series of longitudinal aperturesabout the main opening therethrough, the end of the venturi throughwhich the apertures open being in the shape of a truncated cone, anannular deflector positioned in spaced relation with the end of theventuri and adapted to deflect the air from the said apertures inwardlyand a bypass leading from the said chamber of the venturi having the tworestrictions and discharging into the first named venturi. i

2. In a carburetor, a main air conduit through which air is adapted toflow in two directions, a venturi in the main conduit having two pointsof restriction forming a chamber therebetween, a valve controlled jetopening through the first point of restriction,

the venturi being provided with a series of longitudinal aperturestherethrough about the main opening therethrough and being in the formof a truncated cone at the end, an annular deflector positioned in themain conduit in spaced relation with the end of the venturi, a venturiin the end of the main conduit about which air from the opposite end ofthe main conduit is adapted to flow, the said venturi being providedwith a series of apertures opening therethrough and adapted to directthe air inwardly against the flow through the venturi, and a bypass forfuel and air leading from the said chamber ofthe venturi having'the twopoints of restriction and discharging the last named venturi at thepoint of greatest restriction.

3. In a carburetor, a U shaped main conduit, an air inlet opening intothe U shaped main conduit, a chamber into which one end of the mainconduit discharges, a venturi through which the opposite end of the mainconduit discharges, the chamber surrounding the venturi and the venturibeing provided with a series of angular apertures adapted to direct airinwardly from the chamber against the flow through the venturi, aventuri in the main conduit intermediate its ends having two points ofrestriction forming a chamber therebetween, a valve controlled liquidfuel nozzle opening into the said venturi at the first point ofrestriction, the said venturi being provided with a series oflongitudinal apertures about the main opening therethrough, and a bypassfor fuel and air extending from the chamber of the venturi having thetwo points of restrictionand discharging to the venturi at the discharge end of the main conduit.

4. In a carburetor, a main air conduit, means for admitting air into themain air conduit. intermediate its ends, the air' being adapted to flowin opposite directions through the main conduit, a venturi in one end ofthe main conduit, a chamber into which the opposite end of the mainconduit discharges, the said chamber surrounding the venturi and theventuri being provided with a series of angularly positioned aperturesadapted to direct air inwardly from the chamber against the flow throughthe venturi.

5. In a carburetor, a U shaped main conduit. a chamber into which oneend of the conduit discharges, a venturi through which the opposite endof the main conduit discharges, the chamber surrounding the venturi, andthe venturi being provided with a series of angular apertures adapted todirect air inwardly from the chamber against the flow through theventuri.

In testimony whereof I sign this specification.

MYRON B. LLOYD.

